<!DOCTYPE html>
<html>
<head>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        li{
            list-style: none;
        }
        .top{
            height: 50px;
            background-color: gray;
        }
        .banner{
            width: 980px;
            height: 150px;
            margin: 10px auto;
            background-color: gray;
        }
        .box{
            width: 980px;
            margin: 0 auto;
            height: 300px;
            background-color: pink;
        }

        .box li{
            width: 237px;
            height: 300px;
            background-color: gray;
            float: left;
            margin-right: 10px;
        }
        .box .last{
            margin-right: 0;
        }
        .footer{
            height: 200px;
            background-color: gray;
            margin-top: 10px;
        }
    </style>
</head>
<body>
    <div class="top"></div>
    <div class="banner"></div>
    <div class="box">
        <ul>
            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li class="last">4</li>
        </ul>
    </div>
    <div class="footer"></div>
</body>
</html>